1 /* 2 * Implementation of s390 diagnose codes 3 * 4 * Copyright IBM Corp. 2007 5 * Author(s): Michael Holzheu <holzheu@de.ibm.com> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/cpu.h> 10 #include <linux/seq_file.h> 11 #include <linux/debugfs.h> 12 #include <asm/diag.h> 13 #include <asm/trace/diag.h> 14 15 struct diag_stat { 16 unsigned int counter[NR_DIAG_STAT]; 17 }; 18 19 static DEFINE_PER_CPU(struct diag_stat, diag_stat); 20 21 struct diag_desc { 22 int code; 23 char *name; 24 }; 25 26 static const struct diag_desc diag_map[NR_DIAG_STAT] = { 27 [DIAG_STAT_X008] = { .code = 0x008, .name = "Console Function" }, 28 [DIAG_STAT_X00C] = { .code = 0x00c, .name = "Pseudo Timer" }, 29 [DIAG_STAT_X010] = { .code = 0x010, .name = "Release Pages" }, 30 [DIAG_STAT_X014] = { .code = 0x014, .name = "Spool File Services" }, 31 [DIAG_STAT_X044] = { .code = 0x044, .name = "Voluntary Timeslice End" }, 32 [DIAG_STAT_X064] = { .code = 0x064, .name = "NSS Manipulation" }, 33 [DIAG_STAT_X09C] = { .code = 0x09c, .name = "Relinquish Timeslice" }, 34 [DIAG_STAT_X0DC] = { .code = 0x0dc, .name = "Appldata Control" }, 35 [DIAG_STAT_X204] = { .code = 0x204, .name = "Logical-CPU Utilization" }, 36 [DIAG_STAT_X210] = { .code = 0x210, .name = "Device Information" }, 37 [DIAG_STAT_X224] = { .code = 0x224, .name = "EBCDIC-Name Table" }, 38 [DIAG_STAT_X250] = { .code = 0x250, .name = "Block I/O" }, 39 [DIAG_STAT_X258] = { .code = 0x258, .name = "Page-Reference Services" }, 40 [DIAG_STAT_X288] = { .code = 0x288, .name = "Time Bomb" }, 41 [DIAG_STAT_X2C4] = { .code = 0x2c4, .name = "FTP Services" }, 42 [DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" }, 43 [DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" }, 44 [DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" }, 45 [DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" }, 46 }; 47 48 static int show_diag_stat(struct seq_file *m, void *v) 49 { 50 struct diag_stat *stat; 51 unsigned long n = (unsigned long) v - 1; 52 int cpu, prec, tmp; 53 54 get_online_cpus(); 55 if (n == 0) { 56 seq_puts(m, " "); 57 58 for_each_online_cpu(cpu) { 59 prec = 10; 60 for (tmp = 10; cpu >= tmp; tmp *= 10) 61 prec--; 62 seq_printf(m, "%*s%d", prec, "CPU", cpu); 63 } 64 seq_putc(m, '\n'); 65 } else if (n <= NR_DIAG_STAT) { 66 seq_printf(m, "diag %03x:", diag_map[n-1].code); 67 for_each_online_cpu(cpu) { 68 stat = &per_cpu(diag_stat, cpu); 69 seq_printf(m, " %10u", stat->counter[n-1]); 70 } 71 seq_printf(m, " %s\n", diag_map[n-1].name); 72 } 73 put_online_cpus(); 74 return 0; 75 } 76 77 static void *show_diag_stat_start(struct seq_file *m, loff_t *pos) 78 { 79 return *pos <= nr_cpu_ids ? (void *)((unsigned long) *pos + 1) : NULL; 80 } 81 82 static void *show_diag_stat_next(struct seq_file *m, void *v, loff_t *pos) 83 { 84 ++*pos; 85 return show_diag_stat_start(m, pos); 86 } 87 88 static void show_diag_stat_stop(struct seq_file *m, void *v) 89 { 90 } 91 92 static const struct seq_operations show_diag_stat_sops = { 93 .start = show_diag_stat_start, 94 .next = show_diag_stat_next, 95 .stop = show_diag_stat_stop, 96 .show = show_diag_stat, 97 }; 98 99 static int show_diag_stat_open(struct inode *inode, struct file *file) 100 { 101 return seq_open(file, &show_diag_stat_sops); 102 } 103 104 static const struct file_operations show_diag_stat_fops = { 105 .open = show_diag_stat_open, 106 .read = seq_read, 107 .llseek = seq_lseek, 108 .release = seq_release, 109 }; 110 111 112 static int __init show_diag_stat_init(void) 113 { 114 debugfs_create_file("diag_stat", 0400, NULL, NULL, 115 &show_diag_stat_fops); 116 return 0; 117 } 118 119 device_initcall(show_diag_stat_init); 120 121 void diag_stat_inc(enum diag_stat_enum nr) 122 { 123 this_cpu_inc(diag_stat.counter[nr]); 124 trace_s390_diagnose(diag_map[nr].code); 125 } 126 EXPORT_SYMBOL(diag_stat_inc); 127 128 void diag_stat_inc_norecursion(enum diag_stat_enum nr) 129 { 130 this_cpu_inc(diag_stat.counter[nr]); 131 trace_s390_diagnose_norecursion(diag_map[nr].code); 132 } 133 EXPORT_SYMBOL(diag_stat_inc_norecursion); 134 135 /* 136 * Diagnose 14: Input spool file manipulation 137 */ 138 static inline int __diag14(unsigned long rx, unsigned long ry1, 139 unsigned long subcode) 140 { 141 register unsigned long _ry1 asm("2") = ry1; 142 register unsigned long _ry2 asm("3") = subcode; 143 int rc = 0; 144 145 asm volatile( 146 " sam31\n" 147 " diag %2,2,0x14\n" 148 " sam64\n" 149 " ipm %0\n" 150 " srl %0,28\n" 151 : "=d" (rc), "+d" (_ry2) 152 : "d" (rx), "d" (_ry1) 153 : "cc"); 154 155 return rc; 156 } 157 158 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode) 159 { 160 diag_stat_inc(DIAG_STAT_X014); 161 return __diag14(rx, ry1, subcode); 162 } 163 EXPORT_SYMBOL(diag14); 164 165 /* 166 * Diagnose 210: Get information about a virtual device 167 */ 168 int diag210(struct diag210 *addr) 169 { 170 /* 171 * diag 210 needs its data below the 2GB border, so we 172 * use a static data area to be sure 173 */ 174 static struct diag210 diag210_tmp; 175 static DEFINE_SPINLOCK(diag210_lock); 176 unsigned long flags; 177 int ccode; 178 179 spin_lock_irqsave(&diag210_lock, flags); 180 diag210_tmp = *addr; 181 182 diag_stat_inc(DIAG_STAT_X210); 183 asm volatile( 184 " lhi %0,-1\n" 185 " sam31\n" 186 " diag %1,0,0x210\n" 187 "0: ipm %0\n" 188 " srl %0,28\n" 189 "1: sam64\n" 190 EX_TABLE(0b, 1b) 191 : "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory"); 192 193 *addr = diag210_tmp; 194 spin_unlock_irqrestore(&diag210_lock, flags); 195 196 return ccode; 197 } 198 EXPORT_SYMBOL(diag210); 199